Brown trout - brown trout

A fish belonging to the Salmonidae family of the Osteichthyes class. Its body color is yellowish brown, with large black and crimson spots scattered on its sides. It is distributed throughout northern and central Europe, from the Black Sea, the Caspian Sea, and the Aral Sea to North Africa. There are many regional subspecies. It generally lives in freshwater, but there is also a sea-run and river-run sea trout, and the relationship between the two is similar to that between yamame and cherry salmon. Sea trout appeared from brown-type fish transplanted to South America and Tasmania, which shows that there is essentially no difference between the two types. It was mainly introduced to Japan via North America, and released into ponds along Lake Chuzenji and the Azusa River in Kamikochi, and cold-water lakes in mountainous areas, where it grows large by devouring small fish and aquatic insects. It is quite difficult to cultivate in ponds. It is wild, making it an interesting target for fishing, and its meat is delicious.

[Tatsuro Kubo]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

硬骨魚綱サケ目サケ科に属する魚。体色は黄褐色、体側に粗大な黒点と朱紅点が散在する。分布はヨーロッパの北部・中部の全域、黒海、カスピ海、アラル海周辺から北アフリカにも及ぶ。地域による亜種が多い。一般に淡水生活型であるが、一方、降海・遡河(そか)型のシートラウトがあり、両者の関係はヤマメとサクラマスの関係に似る。南アメリカやタスマニア島に移殖されたブラウン型のものからシートラウトが現れることから、両型に本質的な差のないことがわかる。日本にはおもに北アメリカを経て移入され、中禅寺湖、上高地梓(あずさ)川沿いの池や山岳地帯の冷水湖に放され、小魚、水生昆虫を貪食(どんしょく)して大きく成長する。池中養殖はかなりむずかしい。野生的で釣りの対象としておもしろく、肉味は佳良である。

［久保達郎］

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